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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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howtos:general_admin:cli_constructs_and_useful_info [2012/12/24 12:08 (UTC)] hazel [Regex] |
howtos:general_admin:cli_constructs_and_useful_info [2013/04/02 15:19 (UTC)] htexmexh [Constructs] |
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| Line 9: | Line 9: | ||
| ls -1 /var/log/packages | rev | cut -d - -f 1-3 --complement | rev | ls -1 /var/log/packages | rev | cut -d - -f 1-3 --complement | rev | ||
| </code> | </code> | ||
| - | Or if you wanted to get the full patch of a file, minus the suffix. | + | Or if you wanted to get the full path of a file, minus the suffix. |
| <code bash> | <code bash> | ||
| echo /proc/config.gz | rev | cut -d. -f1 --complement | rev | echo /proc/config.gz | rev | cut -d. -f1 --complement | rev | ||
| Line 174: | Line 174: | ||
| * Example: ''\<[tT]he\>'' matches the word ''the'' or ''The''. | * Example: ''\<[tT]he\>'' matches the word ''the'' or ''The''. | ||
| * ''*'' matches any number of the previous character or nothing = no character. Example: ''[0-9]*'' which will match any number of numbers. ''.*'' matches any number of anything. | * ''*'' matches any number of the previous character or nothing = no character. Example: ''[0-9]*'' which will match any number of numbers. ''.*'' matches any number of anything. | ||
| - | === Extended === | + | === Extended regular expressions === |
| The following must be supported by the program for them to work. For example for grep you must run ''egrep'' or ''grep -E''. | The following must be supported by the program for them to work. For example for grep you must run ''egrep'' or ''grep -E''. | ||
| * ''+'' matches any number of the previous character, like ''*'', but there must be at least one to match, so it will not match nothing or no character. | * ''+'' matches any number of the previous character, like ''*'', but there must be at least one to match, so it will not match nothing or no character. | ||
| Line 204: | Line 204: | ||
| </code> | </code> | ||
| === cmp === | === cmp === | ||
| - | This can compare two files byte by byte, and can be more useful that checksums. For example, after you burn a CD/DVD, you can run: | + | This can compare two files byte by byte, and can be more useful than checksums. For example, after you burn a CD/DVD, you can run: |
| <code bash> | <code bash> | ||
| cmp slackware.iso /dev/sr0 | cmp slackware.iso /dev/sr0 | ||
